Practical Research 1: Lesson 8 Writing the Thesis Statement.pptx
Basic 3 Phase (1).ppt
1. POLYPHASE CIRCUITS
LEARNING GOALS
Three Phase Circuits
Advantages of polyphase circuits
Three Phase Connections
Basic configurations for three phase circuits
Source/Load Connections
Delta-Y connections
Power Relationships
Study power delivered by three phase circuits
Power Factor Correction
Improving power factor for three phase circuits
14. Y
Y
b
a
ab R
R
R
)
(
|| 3
1
2 R
R
R
Rab
3
2
1
3
1
2 )
(
R
R
R
R
R
R
R
R b
a
3
2
1
2
1
3 )
(
R
R
R
R
R
R
R
R c
b
3
2
1
3
2
1 )
(
R
R
R
R
R
R
R
R a
c
SUBTRACT THE FIRST TWO THEN ADD
TO THE THIRD TO GET Ra
a
b
b
a
R
R
R
R
R
R
R
R 1
3
3
1
c
b
c
b
R
R
R
R
R
R
R
R 1
2
1
2
REPLACE IN THE THIRD AND SOLVE FOR R1
Y
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
c
b
a
3
2
1
1
3
3
2
1
3
2
3
2
1
2
1
Y
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
a
a
c
c
b
b
a
c
a
c
c
b
b
a
b
a
c
c
b
b
a
3
2
1
tions
Transforma
Y
OF
REVIEW
15. POWER FACTOR CORRECTION
Balanced
load
Low pf
lagging
Similar to single phase case.
Use capacitors to increase the
power factor
Keep clear about total/phase
power, line/phase voltages
added
be
to
Power
Reactive
old
new Q
Q
Q
To use capacitors this value
should be negative
2
1
sin
cos pf
pf f
f
2
1
tan
pf
pf
f
0
Q
lagging
f
P
Q
tan
16. LEARNING EXAMPLE
leading
pf
rms
kV
V
Hz
f line 94
.
0
.
5
.
34
|
|
,
60
:
Required
626
.
0
1
sin
cos 2
pf
pf f
f
MW
P
MVA
Q
old
old
72
.
18
02
.
15
|
|
2
1
tan
pf
pf
f
0
old
Q
lagging
f
f
f
pf
S
Q
S
P
jQ
P
S
cos
sin
|
|
cos
|
|
f
P
Q
tan
MVA
Q
leading
pf
MW
P
new
new
old
8
.
6
94
.
0
72
.
18
MVA
Q
MVA
Q
273
.
7
82
.
21
02
.
15
8
.
6
capacitor
per
rms
kV
V
Y
3
5
.
34
capacitor
connection
2
3
6
3
10
5
.
34
60
2
10
273
.
7
C
F
C
6
.
48
17. LEARNING BY DESIGN
Proposed new store
rms
A
170
at
rated
wire
#4ACSR
kVA
j
S
420
560
9
.
36
700
1
kVA
j
kVA
S
866
500
60
1000
2
kVA
j
kVA
S
349
720
8
.
25
800
3
kVA
kVA
j
Stotal
57
.
42
2417
1635
1780
rms
A
V
S
I
line
total
line 1
.
101
10
8
.
13
3
10
417
.
2
3
|
|
|
| 3
6
Wire is OK
new
new
old
Q
pf
P
old
new Q
Q
Q
)
(
tan new
f
P
kVA
28
.
758
kVA
72
.
876
2
capacitor
per
|
| CV
Q
3
/
10
8
.
13
60
2
3
/
10
72
.
876
2
3
3
C F
2
.
12